- Younger sister of Jordana Brewster.
- Youngest of 2 daughters in family of investment banker Alden Bewster & model Maria João.
- Sister-in-law of Andrew Form.
- Aunt of Julian Brewster-Form (b.September 10, 2013).
- (January 30, 2014) Married her boyfriend of a year Baron Davis following a 5-month-long engagement.
- Isabella and husband Baron Davis are expecting their second child early next year.
- (August 22, 2014) Gave birth to her 1st child, a son named Kingman Davis, with her husband Baron Davis.
- (January 10, 2016) Gave birth to her 2nd child, a son named Luke Alden Davis, with her husband Baron Davis.
- Is a distant cousin of Brandon Routh, as he is also a descendant of Mayflower passenger William Brewster.
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